Source Code Cross Referenced for ContainerDefinitionDelegate.java in  » Web-Framework » cocoon » org » apache » cocoon » woody » formmodel » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » cocoon » org.apache.cocoon.woody.formmodel 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         * 
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         * 
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.cocoon.woody.formmodel;
018:
019:        import java.util.ArrayList;
020:        import java.util.HashMap;
021:        import java.util.Iterator;
022:        import java.util.List;
023:        import java.util.ListIterator;
024:        import java.util.Map;
025:
026:        // TODO: Refine and i18n the exception messages.
027:        /**
028:         * Helper class for the Definition implementation of widgets containing
029:         * other widgets.
030:         * 
031:         * @version $Id: ContainerDefinitionDelegate.java 433543 2006-08-22 06:22:54Z crossley $
032:         */
033:        public class ContainerDefinitionDelegate {
034:            private List widgetDefinitions = new ArrayList();
035:            private Map widgetDefinitionsById = new HashMap();
036:            private WidgetDefinition definition;
037:            private boolean resolving;
038:            private ListIterator definitionsIt = widgetDefinitions
039:                    .listIterator();
040:
041:            /**
042:             * @param definition the widget definition to which this container delegate belongs
043:             */
044:            public ContainerDefinitionDelegate(WidgetDefinition definition) {
045:                this .definition = definition;
046:                resolving = false;
047:            }
048:
049:            public void addWidgetDefinition(WidgetDefinition widgetDefinition)
050:                    throws DuplicateIdException {
051:                String id = widgetDefinition.getId();
052:                // Do not add NewDefinition id's hash.
053:                if (!(widgetDefinition instanceof  NewDefinition)) {
054:                    if (widgetDefinitionsById.containsKey(id)) {
055:                        String duplicateLocation = widgetDefinition
056:                                .getLocation();
057:                        String containerLocation = definition.getLocation();
058:                        String firstLocation = getWidgetDefinition(id)
059:                                .getLocation();
060:                        throw new DuplicateIdException("Duplicate widget id \""
061:                                + id + "\" detected at " + duplicateLocation
062:                                + ".\n" + "Container widget \""
063:                                + definition.getId() + "\" at "
064:                                + containerLocation + "\n"
065:                                + "already contains a widget with id \"" + id
066:                                + "\" at " + firstLocation + ".");
067:                    }
068:                    widgetDefinitionsById.put(widgetDefinition.getId(),
069:                            widgetDefinition);
070:                }
071:                this .definitionsIt.add(widgetDefinition);
072:            }
073:
074:            public List getWidgetDefinitions() {
075:                return widgetDefinitions;
076:            }
077:
078:            public boolean hasWidget(String id) {
079:                return widgetDefinitionsById.containsKey(id);
080:            }
081:
082:            public WidgetDefinition getWidgetDefinition(String id) {
083:                return (WidgetDefinition) widgetDefinitionsById.get(id);
084:            }
085:
086:            public boolean isResolving() {
087:                return resolving;
088:            }
089:
090:            public void resolve(List parents, WidgetDefinition parent)
091:                    throws Exception {
092:                if (!resolving) {
093:                    resolving = true;
094:                    this .definitionsIt = widgetDefinitions.listIterator();
095:                    parents.add(definition);
096:                    while (this .definitionsIt.hasNext()) {
097:                        WidgetDefinition widgetDefinition = (WidgetDefinition) this .definitionsIt
098:                                .next();
099:                        // ClassDefinition's get resolved by NewDefinition rather than here.
100:                        if (!(widgetDefinition instanceof  ClassDefinition)) {
101:                            if (widgetDefinition instanceof  NewDefinition) {
102:                                // Remove NewDefinition in preparation for its referenced class of widget definitions to be added.
103:                                this .definitionsIt.remove();
104:                                ((NewDefinition) widgetDefinition).resolve(
105:                                        parents, definition);
106:                            } else {
107:                                if (widgetDefinition instanceof  ContainerDefinition)
108:                                    ((ContainerDefinition) widgetDefinition)
109:                                            .resolve(parents, definition);
110:                            }
111:                        }
112:                    }
113:                    parents.remove(parents.size() - 1);
114:                    resolving = false;
115:                } else {
116:                    // Non-terminating recursion detection
117:                    if (resolving == true) {
118:                        // Search up parent list in hopes of finding a "Union" before finding previous "New" for this "Class".
119:                        ListIterator parentsIt = parents.listIterator(parents
120:                                .size());
121:                        while (parentsIt.hasPrevious()) {
122:                            WidgetDefinition widgetDefinition = (WidgetDefinition) parentsIt
123:                                    .previous();
124:                            if (widgetDefinition instanceof  UnionDefinition)
125:                                break;
126:                            if (widgetDefinition == definition) {
127:                                String location = definition.getLocation();
128:                                if (parent instanceof  FormDefinition) {
129:                                    throw new Exception(
130:                                            "Container: Non-terminating recursion detected in form definition ("
131:                                                    + location + ")");
132:                                } else {
133:                                    throw new Exception(
134:                                            "Container: Non-terminating recursion detected in widget definition: "
135:                                                    + parent.getId() + " ("
136:                                                    + location + ")");
137:                                }
138:                            }
139:                        }
140:                    }
141:                }
142:            }
143:
144:            public void createWidget(Widget parent, String id) {
145:                WidgetDefinition widgetDefinition = (WidgetDefinition) widgetDefinitionsById
146:                        .get(id);
147:                if (widgetDefinition == null) {
148:                    throw new RuntimeException(definition.getId()
149:                            + ": WidgetDefinition \"" + id
150:                            + "\" does not exist (" + definition.getLocation()
151:                            + ")");
152:                }
153:                Widget widget = widgetDefinition.createInstance();
154:                if (widget != null)
155:                    ((ContainerWidget) parent).addWidget(widget);
156:            }
157:
158:            public void createWidgets(Widget parent) {
159:                Iterator definitionsIt = widgetDefinitions.iterator();
160:                while (definitionsIt.hasNext()) {
161:                    WidgetDefinition widgetDefinition = (WidgetDefinition) definitionsIt
162:                            .next();
163:                    Widget widget = widgetDefinition.createInstance();
164:                    if (widget != null)
165:                        ((ContainerWidget) parent).addWidget(widget);
166:                }
167:            }
168:        }
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